trivial change : modify the spelling mistake of comments
Add comments for Channel::revents_
modify the definition type of TcpServer::threadPool_ to boost::shared_ptr<EventLoopThreadPool>
Modify the spelling mistake of comments, and add comments for Inspector::add
fix CMake error about pthread
Looking for include file pthread.h - not found
Could NOT find Threads (missing:  Threads_FOUND)
Merge pull request #76 from trymuduo/master

Fix CMake error about pthread
Merge pull request #70 from weizili/patch-Inspector

Fix typo in comments, also add comments for Inspector::add
Merge pull request #72 from weizili/patch-Chennel

Add comments for Channel::revents_
Merge pull request #74 from weizili/patch-TcpClient

trivial change : fix the spelling mistake of comments
Merge pull request #75 from weizili/patch-TcpServer

Hold TcpServer::threadPool_ as shared_ptr, so it can be shared among TcpServers.